Coal and rock drilling bit.



J. EAGEN.

GOAL AND ROOK DRILLING BIT.

IIIIIIIIIIIIIII D AUG-.29,1910.

` 985,332. Patented Feb.28,1911. if ff/yi 1% Z 1 I d I f4 Z0 ,Z9/W3. j? 4 f2 d f5 97 if i, im 526 ful E' .Z5

readily and at will.

JAMES EAGEN, OF WYOMING, PENNSYLVANIA.

COAL AND ROCK Specification of Letters Patent.

DRILLING BIT.

Application filed August 29, 1910. Serial No. 579,369.

To all whom it may concern:

le it kno-wn that l, JAMES EAGEN, a citizen ot the United States, residing at lVyoming, in the county ot Luzerne and State olf Pennsylvania, have invented a new and use'lul Coal and .Rock Drilling Bit, of which the following is a specification.

This invention belongs to the art of drills, and it particularly relates to a new and usei'ul coal and rock drilling bit.

Primarily speaking, the object of the invention is to provide a drilling bit having a sectional shank which maybe disassembled A further object of the invention is to provide a bit which may be reversed, in order to increase the diameter of the hole to be drilled, and to provide an oit-standing cutter, which may be removed easily, or inserted .in its place very readily.

Other features and combinations of parts will be hereinafter set fort-h, shown in the drawings, and claimed.

In the drawings, Figure 1 is an elevation of the bit and its sectional shank. Fig. 2 is a longitudinal sectional view through the sectional shank, showing the bit and its offset cutter in elevation. Fig. 3 is a sectional view on line 3 3 oit Fig. 2. Fig. 4L is a detail view of the bit and its o-tflset cutter. Fig. 5 is a sectional view on line 5 5 of Fig. 2, showing that the socket 11 is formed elongated and transversely of the section 1 of the shank. v

Referring to the drawings, 1 denotes the shank of the bit, which is composed of three sections, 1, 2 and 3. These sections are connected together by threaded connections 1 and 5. The vshank is provided with the usual spirally arranged flanges 6 and 7. The three sections of the shank are so connected, that the Hanges 8 and 9 of the sections 1 and 3 are brought into registration with the lianges 6 and 7 of the section 2. This is for the purpose of forming the flanges continuous and unbroken. The section 3 is provided with a rectangular recess 10 whereby the shank of the drill may be connected to the usual form of drilling ma-` chine.

The section 1 is provided with a socket 11, for the reception of the bit 12. This socket 11 is elongated transversely of the section 1, in order to permit ofthe reception of the off-set cutter member 13. This cutter member 12-3 is provided with a cutting edge 14C, while the shank 15 (which is received in tle socket) is provided at its extremity with a lip 16. This lip engages the end 17 of the shank ot the bit 12, in order to prevent accidental displacement of the cutter. EX- tending transversely ot the section 1 and its socket, and through the shank of the bit 12, is a coller pin 1S, which secures the bit and the cutter securely in their positions. Tt will be seen, however, that the cutter 13 may be removed entirely, without disturbing the secure position of the bit 12.

The cutter 13 has its cutting blade ott-set, from its shank, in order to form the shoul der 19, adjacent which the shoulder 20 of the bit 12 is arranged. It will be observed that by withdrawing the cotter pin 18, and then removing the bit 12, the same may be reinserted in the socket in a reversed posin tion, as shown clearly in Fig. 1. By so do ing, one may drill holes of diameters greater than if the bit is arranged as shown in Fig. 2. The bit 12 is provided with cutting edges 21.

ln Fig. t the bit 12 is slightly modified. For example, the working end of the bit is twisted as at 22, and has its extremity split, as shown at 23. The twisting of the bit is to render the work of drilling easier, and furthermore assist in removing the excess of dust.

From the above, it will be observed that a novel reversible bit is produced, designed to cooperate with the off-set cutter, whereby holes of various diameters may be drilled. Moreover, it will be noted that a novel shank for carrying the bit is produced.

The invention having been set forth, what is claimed as new and useful is:

The combination of a sectional drill shank having a socket at one end the walls of which being provided with apertures arranged in registration and in alinement with the center of the shank, said socket being extended laterally to one side of the shank; a cutter comprising a shank including an offset cutting member merging into the shank by way of a shoulder, said shank including a lip extending laterally to one side of the shank at the end thereof, said shank being received within the laterally extending portion of the socket; a drill bit comprising a shank and adrilling portion, said bit intermediate the shank and the drilling portion Patented Feb. 28, 1911.

having :L shoulder to engage the Shoulder' of the cutter, the shank of the loit having its end portion Curved on an are Capable of fitting the lip when disposed so that. the said shoulders muy engage or in a. reverse position said reversal Causing a hole of a greater diameter to loe drilled, said bit shank having on aperture in registration with the apertures of the Socket; and a. colter pin ex- J tending' through the zl-jipertnre thus :Lnehor- 10 ingl the loitand the Cutter in place.

l n testimony that, yT elniin,- the foregoing as my own, I have hereto affixed my signature in the presence ot' two Witnesses.

JAMES- HAGEN.

VVitneSses MICHAEL P. COLLINS,

S. B. SAXE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

